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MIC PREAMP for PC speaker

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avz

Member
Hi all
I would like to connect a microphone to pc speakers that have a built in amplifier. to do that I need a preamp. can you recommend a simple circuit that will do?
Thanks.
 
Hi all
I would like to connect a microphone to pc speakers that have a built in amplifier. to do that I need a preamp. can you recommend a simple circuit that will do?
Thanks.

What kind of microphone?


Torben
 
A pc usually uses an electret mic.
You need a switch to disconnect the mic when the speaker is playing and disconnect the speaker when the mic is used to avoid acoustical feedback howling.
 
Here is a preamp circuit for an electret mic:
 

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    electret mic preamp2.PNG
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